# one time setup
$ go get -u github.com/xenolf/lego
$ lego --email letsencrypt@example.com --domains example.com --path /var/letsencrypt --webroot /var/letsencrypt/webcache run

# renew (can be run from cron)
$ lego --email letsencrypt@example.com --domains example.com --path /var/letsencrypt --webroot /var/letsencrypt/webcache renew